Endemic iodine deficiency was historically common in the midwestern US, but following voluntary salt iodization in the 1920s, US iodine status was thought to be adequate. However, data from national surveys indicate a sharp decline in estimated iodine intake in recent decades, with the decline thought to be mainly due to changes in commercial processing of milk and bread.
Norway considers iodization of household salt and salt in bread
(Opinion of the Panel on Nutrition of the Norwegian Scientific Committee for Food and Environment)
To ensure adequate iodine intake in the population, particularly in young women, Norwegian experts recently assessed the potential benefits and risks of iodization of household salt and industrialized salt in bread.
Iodine deficiency in British pregnant women predicts poor birth outcomes but not later child development
(From: Threapleton DE, et al. Maternal iodine status in a multi-ethnic UK birth cohort)
In pregnant women with mild-to-moderate iodine deficiency in the 2nd trimester, poorer maternal iodine status was associated with low birthweight but did not predict child development at age 4–7 years.